{"id":12408,"date":"2025-11-13T18:36:01","date_gmt":"2025-11-13T09:36:01","guid":{"rendered":"https:\/\/rakkoserver.com\/plus\/?p=11588"},"modified":"2025-11-13T18:36:01","modified_gmt":"2025-11-13T09:36:01","slug":"tool-subnet-calculator","status":"publish","type":"post","link":"https:\/\/rakkokeyword.com\/techo\/tool-subnet-calculator\/","title":{"rendered":"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u8a08\u7b97\u30c4\u30fc\u30eb"},"content":{"rendered":"\n<div id=\"subnet-calculator-tool\">\n  <style>\n    #subnet-calculator-tool {\n      font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif;\n      color: #222222;\n      font-size: 14px;\n      line-height: 1.5;\n    }\n\n    #subnet-calculator-tool * {\n      box-sizing: border-box;\n    }\n\n    #subnet-calculator-tool .subnet-inner {\n      \/* \u5916\u67a0\u306b\u306f padding \/ border \u3092\u4ed8\u3051\u306a\u3044 *\/\n    }\n\n    #subnet-calculator-tool .subnet-title {\n      font-weight: 600;\n      font-size: 18px;\n      margin: 0 0 12px 0;\n    }\n\n    #subnet-calculator-tool .subnet-description {\n      margin: 0 0 16px 0;\n      color: #555555;\n      font-size: 13px;\n    }\n\n    #subnet-calculator-tool .subnet-input-group {\n      display: flex;\n      flex-wrap: wrap;\n      gap: 12px;\n      align-items: flex-end;\n      margin-bottom: 8px;\n    }\n\n    #subnet-calculator-tool .subnet-input-row {\n      display: flex;\n      flex-direction: column;\n      gap: 4px;\n      min-width: 200px;\n    }\n\n    #subnet-calculator-tool .subnet-label {\n      font-size: 13px;\n      color: #333333;\n      margin: 0;\n    }\n\n    #subnet-calculator-tool .subnet-input,\n    #subnet-calculator-tool .subnet-select {\n      width: 100%;\n      border: 1px solid #cccccc;\n      border-radius: 3px;\n      padding: 6px 8px;\n      font-size: 14px;\n    }\n\n    #subnet-calculator-tool .subnet-input:focus,\n    #subnet-calculator-tool .subnet-select:focus {\n      outline: none;\n      border-color: #007cba;\n      box-shadow: 0 0 0 1px #007cba26;\n    }\n\n    #subnet-calculator-tool .subnet-buttons {\n      display: flex;\n      flex-wrap: wrap;\n      gap: 8px;\n      margin-bottom: 8px;\n    }\n\n    #subnet-calculator-tool .subnet-button {\n      border: none;\n      border-radius: 3px;\n      padding: 6px 12px;\n      font-size: 14px;\n      cursor: pointer;\n    }\n\n    #subnet-calculator-tool .subnet-button-primary {\n      background-color: #007cba;\n      color: #ffffff;\n    }\n\n    #subnet-calculator-tool .subnet-button-primary:disabled {\n      opacity: 0.5;\n      cursor: not-allowed;\n    }\n\n    #subnet-calculator-tool .subnet-button-secondary {\n      background-color: #f5f5f5;\n      color: #333333;\n      border: 1px solid #cccccc;\n    }\n\n    #subnet-calculator-tool .subnet-error {\n      color: #cc0000;\n      font-size: 12px;\n      margin: 0 0 8px 0;\n      min-height: 16px;\n    }\n\n    #subnet-calculator-tool .subnet-status {\n      color: #666666;\n      font-size: 12px;\n      margin: 0 0 8px 0;\n      min-height: 16px;\n    }\n\n    #subnet-calculator-tool .subnet-results {\n      display: none; \/* \u521d\u671f\u306f\u975e\u8868\u793a\u3001\u8a08\u7b97\u6210\u529f\u6642\u306b\u8868\u793a *\/\n      margin-top: 8px;\n    }\n\n    #subnet-calculator-tool .subnet-section-title {\n      font-weight: 600;\n      font-size: 14px;\n      margin: 16px 0 8px 0;\n    }\n\n    \/* \u4e3b\u8981\u7d50\u679c\uff08\u30e1\u30a4\u30f3\uff09 *\/\n    #subnet-calculator-tool .subnet-main-results {\n      border: 1px solid #dddddd;\n      border-radius: 4px;\n      padding: 12px;\n      background-color: #fafafa;\n    }\n\n    #subnet-calculator-tool .subnet-main-grid {\n      display: grid;\n      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));\n      gap: 12px;\n    }\n\n    #subnet-calculator-tool .subnet-main-item {\n      border-bottom: 1px solid #e0e0e0;\n      padding-bottom: 8px;\n    }\n\n    #subnet-calculator-tool .subnet-main-item:last-child {\n      border-bottom: none;\n      padding-bottom: 0;\n    }\n\n    #subnet-calculator-tool .subnet-main-label {\n      font-size: 12px;\n      color: #555555;\n      margin: 0 0 2px 0;\n    }\n\n    #subnet-calculator-tool .subnet-main-value-row {\n      display: flex;\n      align-items: center;\n      gap: 6px;\n    }\n\n    #subnet-calculator-tool .subnet-main-value {\n      font-size: 16px;\n      font-weight: 600;\n      word-break: break-all;\n    }\n\n    #subnet-calculator-tool .subnet-main-value-small {\n      font-size: 15px;\n      font-weight: 600;\n      word-break: break-all;\n    }\n\n    #subnet-calculator-tool .subnet-copy-button {\n      border: 1px solid #cccccc;\n      border-radius: 3px;\n      padding: 2px 6px;\n      font-size: 11px;\n      background-color: #ffffff;\n      cursor: pointer;\n      white-space: nowrap;\n    }\n\n    #subnet-calculator-tool .subnet-copy-button:hover {\n      background-color: #f2f2f2;\n    }\n\n    \/* \u88dc\u8db3\u60c5\u5831\uff08\u30b5\u30d6\uff09 *\/\n    #subnet-calculator-tool .subnet-sub-results {\n      border: 1px solid #eeeeee;\n      border-radius: 4px;\n      padding: 10px 12px;\n      margin-top: 12px;\n      background-color: #ffffff;\n    }\n\n    #subnet-calculator-tool .subnet-sub-list {\n      margin: 0;\n      padding-left: 16px;\n      font-size: 13px;\n      color: #444444;\n    }\n\n    #subnet-calculator-tool .subnet-sub-list li {\n      margin-bottom: 4px;\n    }\n\n    \/* 10\u9032\u6570 \/ 2\u9032\u6570 \/ 16\u9032\u6570\u30c6\u30fc\u30d6\u30eb *\/\n    #subnet-calculator-tool .subnet-table-wrapper {\n      margin-top: 12px;\n      overflow-x: auto;\n    }\n\n    #subnet-calculator-tool table {\n      border-collapse: collapse;\n      width: 100%;\n      min-width: 480px;\n      font-size: 12px;\n    }\n\n    #subnet-calculator-tool th,\n    #subnet-calculator-tool td {\n      border: 1px solid #dddddd;\n      padding: 6px 8px;\n      text-align: left;\n      vertical-align: top;\n      word-break: break-all;\n    }\n\n    #subnet-calculator-tool th {\n      background-color: #f5f5f5;\n      font-weight: 600;\n    }\n\n    #subnet-calculator-tool .subnet-note {\n      font-size: 11px;\n      color: #777777;\n      margin: 4px 0 0 0;\n    }\n\n    @media (max-width: 480px) {\n      #subnet-calculator-tool .subnet-input-group {\n        flex-direction: column;\n        align-items: stretch;\n      }\n\n      #subnet-calculator-tool .subnet-main-grid {\n        grid-template-columns: 1fr;\n      }\n    }\n  <\/style>\n\n  <div class=\"subnet-inner\">\n    <p class=\"subnet-title\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u8a08\u7b97\u30c4\u30fc\u30eb<\/p>\n    <p class=\"subnet-description\">\n      IPv4\u30a2\u30c9\u30ec\u30b9\u3068CIDR\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u30fb\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u30fb\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u7bc4\u56f2\u306a\u3069\u3092\u81ea\u52d5\u8a08\u7b97\u3057\u307e\u3059\u3002\n    <\/p>\n\n    <div class=\"subnet-input-group\">\n      <div class=\"subnet-input-row\">\n        <p class=\"subnet-label\">IP\u30a2\u30c9\u30ec\u30b9\uff08\u5fc5\u9808\uff09<\/p>\n        <input type=\"text\" class=\"subnet-input\" id=\"subnet-ip-input\" inputmode=\"decimal\" autocomplete=\"off\" placeholder=\"\u4f8b\uff1a192.168.1.1\">\n      <\/div>\n\n      <div class=\"subnet-input-row\">\n        <p class=\"subnet-label\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af \/ CIDR\uff08\u5fc5\u9808\uff09<\/p>\n        <select class=\"subnet-select\" id=\"subnet-cidr-select\"><\/select>\n      <\/div>\n    <\/div>\n\n    <div class=\"subnet-buttons\">\n      <button type=\"button\" class=\"subnet-button subnet-button-primary\" id=\"subnet-calc-button\" disabled>\n        \u8a08\u7b97\u3059\u308b\n      <\/button>\n      <button type=\"button\" class=\"subnet-button subnet-button-secondary\" id=\"subnet-clear-button\">\n        \u30af\u30ea\u30a2\n      <\/button>\n    <\/div>\n\n    <p class=\"subnet-error\" id=\"subnet-error-message\"><\/p>\n    <p class=\"subnet-status\" id=\"subnet-status-message\" aria-live=\"polite\"><\/p>\n\n    <div class=\"subnet-results\" id=\"subnet-results\">\n      <!-- \u4e3b\u8981\u306a\u8a08\u7b97\u7d50\u679c -->\n      <p class=\"subnet-section-title\">\u4e3b\u8981\u306a\u8a08\u7b97\u7d50\u679c<\/p>\n      <div class=\"subnet-main-results\">\n        <div class=\"subnet-main-grid\">\n          <div class=\"subnet-main-item\">\n            <p class=\"subnet-main-label\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9<\/p>\n            <div class=\"subnet-main-value-row\">\n              <span id=\"subnet-network-address\" class=\"subnet-main-value\"><\/span>\n              <button type=\"button\" class=\"subnet-copy-button\" data-copy-target=\"subnet-network-address\">\n                \u30b3\u30d4\u30fc\n              <\/button>\n            <\/div>\n          <\/div>\n\n          <div class=\"subnet-main-item\">\n            <p class=\"subnet-main-label\">\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9<\/p>\n            <div class=\"subnet-main-value-row\">\n              <span id=\"subnet-broadcast-address\" class=\"subnet-main-value\"><\/span>\n              <button type=\"button\" class=\"subnet-copy-button\" data-copy-target=\"subnet-broadcast-address\">\n                \u30b3\u30d4\u30fc\n              <\/button>\n            <\/div>\n          <\/div>\n\n          <div class=\"subnet-main-item\">\n            <p class=\"subnet-main-label\">\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8IP\u7bc4\u56f2<\/p>\n            <div class=\"subnet-main-value-row\">\n              <span id=\"subnet-host-range\" class=\"subnet-main-value-small\"><\/span>\n              <button type=\"button\" class=\"subnet-copy-button\" data-copy-target=\"subnet-host-range\">\n                \u30b3\u30d4\u30fc\n              <\/button>\n            <\/div>\n          <\/div>\n\n          <div class=\"subnet-main-item\">\n            <p class=\"subnet-main-label\">\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u6570<\/p>\n            <div class=\"subnet-main-value-row\">\n              <span id=\"subnet-usable-host-count\" class=\"subnet-main-value-small\"><\/span>\n              <button type=\"button\" class=\"subnet-copy-button\" data-copy-target=\"subnet-usable-host-count\">\n                \u30b3\u30d4\u30fc\n              <\/button>\n            <\/div>\n          <\/div>\n        <\/div>\n        <p class=\"subnet-note\">\n          \u203b \/31\u30fb\/32 \u306a\u3069\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u3067\u306f\u3001\u4e00\u822c\u7684\u306a\u30db\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u300c\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u6570\u300d\u306f 0 \u3068\u3057\u3066\u8868\u793a\u3057\u307e\u3059\u3002\n        <\/p>\n      <\/div>\n\n      <!-- \u88dc\u8db3\u60c5\u5831 -->\n      <p class=\"subnet-section-title\">\u88dc\u8db3\u60c5\u5831<\/p>\n      <div class=\"subnet-sub-results\">\n        <ul class=\"subnet-sub-list\">\n          <li>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af: <span id=\"subnet-mask-decimal\"><\/span><\/li>\n          <li>CIDR\u8868\u8a18: <span id=\"subnet-cidr-text\"><\/span><\/li>\n          <li>\u7dcf\u30db\u30b9\u30c8\u6570: <span id=\"subnet-total-host-count\"><\/span><\/li>\n          <li>IP\u7a2e\u5225: <span id=\"subnet-ip-type\"><\/span><\/li>\n        <\/ul>\n      <\/div>\n\n      <!-- 10\u9032\u6570 \/ 2\u9032\u6570 \/ 16\u9032\u6570\u30c6\u30fc\u30d6\u30eb -->\n      <p class=\"subnet-section-title\">10\u9032\u6570 \/ 2\u9032\u6570 \/ 16\u9032\u6570 \u8a73\u7d30\u8868\u793a<\/p>\n      <div class=\"subnet-table-wrapper\">\n        <table>\n          <thead>\n            <tr>\n              <th>\u9805\u76ee<\/th>\n              <th>10\u9032\u6570<\/th>\n              <th>2\u9032\u6570<\/th>\n              <th>16\u9032\u6570<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>IP\u30a2\u30c9\u30ec\u30b9<\/td>\n              <td id=\"subnet-ip-decimal\"><\/td>\n              <td id=\"subnet-ip-binary\"><\/td>\n              <td id=\"subnet-ip-hex\"><\/td>\n            <\/tr>\n            <tr>\n              <td>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/td>\n              <td id=\"subnet-mask-decimal-detail\"><\/td>\n              <td id=\"subnet-mask-binary\"><\/td>\n              <td id=\"subnet-mask-hex\"><\/td>\n            <\/tr>\n            <tr>\n              <td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9<\/td>\n              <td id=\"subnet-network-decimal\"><\/td>\n              <td id=\"subnet-network-binary\"><\/td>\n              <td id=\"subnet-network-hex\"><\/td>\n            <\/tr>\n            <tr>\n              <td>\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9<\/td>\n              <td id=\"subnet-broadcast-decimal\"><\/td>\n              <td id=\"subnet-broadcast-binary\"><\/td>\n              <td id=\"subnet-broadcast-hex\"><\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <script>\n\n  <\/script>\n<\/div>\n\n\n\n<p>\u3053\u306e\u300c\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u8a08\u7b97\u30c4\u30fc\u30eb\u300d\u306f\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u3068\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\uff08CIDR\u8868\u8a18\uff09\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7bc4\u56f2\u306b\u95a2\u3059\u308b\u4e3b\u8981\u306a\u60c5\u5831\u3092\u5373\u5ea7\u306b\u8a08\u7b97\u3059\u308b\u7121\u6599\u306eWEB\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u3001\u5229\u7528\u53ef\u80fd\u306a\u30db\u30b9\u30c8\u306eIP\u7bc4\u56f2\u3068\u30db\u30b9\u30c8\u6570\u3092\u81ea\u52d5\u3067\u7b97\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3055\u3089\u306b\u3001\u5b66\u7fd2\u8005\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u65b9\u5411\u3051\u306b\u3001\u5404\u30a2\u30c9\u30ec\u30b9\u306e\u300c10\u9032\u6570\u300d\u300c2\u9032\u6570\u300d\u300c16\u9032\u6570\u300d\u306e\u5bfe\u5fdc\u8868\u3082\u8868\u793a\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u306e\u5b9f\u52d9\u304b\u3089\u3001IT\u7cfb\u8cc7\u683c\uff08CCNA\u306a\u3069\uff09\u306e\u5b66\u7fd2\u307e\u3067\u3001\u5e45\u5e83\u304f\u3054\u6d3b\u7528\u3044\u305f\u3060\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-0\">\u30c4\u30fc\u30eb\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u4f7f\u3044\u65b9\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>IP\u30a2\u30c9\u30ec\u30b9\uff08\u5fc5\u9808\uff09:\u8a08\u7b97\u306e\u57fa\u6e96\u3068\u3057\u305f\u3044IPv4\u30a2\u30c9\u30ec\u30b9\u3092 192.168.1.1 \u306e\u5f62\u5f0f\u3067\u5165\u529b\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af \/ CIDR\uff08\u5fc5\u9808\uff09:\u30c9\u30ed\u30c3\u30d7\u30c0\u30a6\u30f3\u30ea\u30b9\u30c8\u304b\u3089\u3001\/24 (255.255.255.0) \u306e\u3088\u3046\u306a\u5f62\u5f0f\u3067\u3001\u4f7f\u7528\u3059\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u307e\u305f\u306fCIDR\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u300c\u8a08\u7b97\u3059\u308b\u300d\u30dc\u30bf\u30f3:\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u5165\u529b\u6b04\u306e\u4e0b\u306b\u300c\u4e3b\u8981\u306a\u8a08\u7b97\u7d50\u679c\u300d\u300c\u88dc\u8db3\u60c5\u5831\u300d\u300c10\u9032\u6570 \/ 2\u9032\u6570 \/ 16\u9032\u6570 \u8a73\u7d30\u8868\u793a\u300d\u304c\u5373\u5ea7\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\uff08\u4efb\u610f\uff09\u30af\u30ea\u30a2\u30dc\u30bf\u30f3:\u5165\u529b\u3057\u305fIP\u30a2\u30c9\u30ec\u30b9\u3068\u8a08\u7b97\u7d50\u679c\u3092\u3059\u3079\u3066\u30ea\u30bb\u30c3\u30c8\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\uff08\u4efb\u610f\uff09\u30b3\u30d4\u30fc\u6a5f\u80fd:\u8a08\u7b97\u7d50\u679c\uff08\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u306a\u3069\uff09\u306e\u6a2a\u306b\u3042\u308b\u30b3\u30d4\u30fc\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u305d\u306e\u5024\u3092\u30af\u30ea\u30c3\u30d7\u30dc\u30fc\u30c9\u306b\u30b3\u30d4\u30fc\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">\u3053\u306e\u30c4\u30fc\u30eb\u304c\u5f79\u7acb\u3064\u3068\u304d\u306f\u3069\u3093\u306a\u3068\u304d\uff1f\uff08\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\uff09<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u30fb\u69cb\u7bc9\u6642\u306b\u65b0\u3057\u3044\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u969b\u3001\u5fc5\u8981\u306a\u30db\u30b9\u30c8\u6570\u304b\u3089\u9069\u5207\u306aCIDR\u3092\u6c7a\u5b9a\u3057\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc4\u56f2\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30a4\u30f3\u30d5\u30e9\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u6642\u306b\u7279\u5b9a\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5c5e\u3057\u3066\u3044\u308b\u304b\u3001\u307e\u305f\u306f\u901a\u4fe1\u3067\u304d\u306a\u3044\u539f\u56e0\u304c\u30bb\u30b0\u30e1\u30f3\u30c8\u306e\u9055\u3044\u306b\u3088\u308b\u3082\u306e\u3067\u306a\u3044\u304b\u3092\u8fc5\u901f\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>IT\u7cfb\u8cc7\u683c\uff08CCNA\u3001LPIC\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u30da\u30b7\u30e3\u30ea\u30b9\u30c8\uff09\u306e\u5b66\u7fd2\u306b\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u624b\u8a08\u7b97\u304c\u6b63\u3057\u3044\u304b\u3069\u3046\u304b\u306e\u300c\u7b54\u3048\u5408\u308f\u305b\u300d\u3084\u30012\u9032\u6570\u30fb16\u9032\u6570\u3078\u306e\u5909\u63db\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084ACL\uff08\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u30ea\u30b9\u30c8\uff09\u306e\u8a2d\u5b9a\u6642\u306b\u8a31\u53ef\u307e\u305f\u306f\u62d2\u5426\u3057\u305f\u3044IP\u30a2\u30c9\u30ec\u30b9\u306e\u300c\u7bc4\u56f2\u300d\u3092\u6b63\u78ba\u306b\u6307\u5b9a\uff08\u4f8b: 192.168.1.0\/24\uff09\u3059\u308b\u305f\u3081\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u3068CIDR\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-2\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u53d6\u5f97\u3059\u308b\u60c5\u5831\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">IP\u30a2\u30c9\u30ec\u30b9 (IPv4)<\/h3>\n\n\n\n<p>IP\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3084PC\u306a\u3069\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u6a5f\u5668\u3092\u8b58\u5225\u3059\u308b\u305f\u3081\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u300c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306e\u4f4f\u6240\u300d\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u30c4\u30fc\u30eb\u3067\u306f <code>192.168.1.1<\/code> \u306e\u3088\u3046\u306b\u30010\u304b\u3089255\u307e\u3067\u306e\u6570\u5b57\u30924\u3064\u7d44\u307f\u5408\u308f\u305b\u3066\u8868\u73fe\u3059\u308b\u300cIPv4\u300d\u65b9\u5f0f\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3068CIDR\uff08\u30b5\u30a4\u30c0\u30fc\uff09<\/h3>\n\n\n\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u3046\u3061\u300c\u3069\u3053\u307e\u3067\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\uff08\u30b0\u30eb\u30fc\u30d7\uff09\u3092\u793a\u3057\u3001\u3069\u3053\u304b\u3089\u304c\u500b\u3005\u306e\u6a5f\u5668\uff08\u30db\u30b9\u30c8\uff09\u3092\u793a\u3059\u304b\u300d\u3092\u533a\u5225\u3059\u308b\u305f\u3081\u306e\u6570\u5024\u3067\u3059\u3002<code>255.255.255.0<\/code> \u306e\u3088\u3046\u306b\u8868\u8a18\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>CIDR\uff08Classless Inter-Domain Routing\uff09\u306f\u3001\u3053\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092 <code>\/24<\/code> \u306e\u3088\u3046\u306b\u30b9\u30e9\u30c3\u30b7\u30e5\u3068\u6570\u5024\u3067\u30b7\u30f3\u30d7\u30eb\u306b\u8868\u73fe\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u6570\u5024\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u30922\u9032\u6570\u3067\u8868\u3057\u305f\u3068\u304d\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u3068\u3057\u3066\u4f7f\u3046\u30d3\u30c3\u30c8\u6570\uff08\u6841\u6570\uff09\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b: \/24 \u306e\u5834\u5408<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af: <code>255.255.255.0<\/code><\/li>\n\n\n\n<li>2\u9032\u6570\u8868\u8a18: <code>11111111.11111111.11111111.00000000<\/code> (\u5148\u982d\u304b\u308924\u500b\u306e1\u304c\u7acb\u3063\u3066\u3044\u308b)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9<\/h3>\n\n\n\n<p>\u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\uff08\u30b0\u30eb\u30fc\u30d7\uff09\u5168\u4f53\u3092\u4ee3\u8868\u3059\u308b\u6700\u521d\u306e\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u500b\u3005\u306e\u6a5f\u5668\uff08\u30db\u30b9\u30c8\uff09\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\uff08\u4f8b: 192.168.1.1 \u3068 \/24 \u306e\u5834\u5408\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u306f 192.168.1.0 \u3068\u306a\u308a\u307e\u3059\uff09<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9<\/h3>\n\n\n\n<p>\u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5c5e\u3059\u308b\u5168\u3066\u306e\u6a5f\u5668\uff08\u30db\u30b9\u30c8\uff09\u306b\u5bfe\u3057\u3066\u3001\u4e00\u6589\u306b\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\uff08\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\uff09\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u6700\u5f8c\u306e\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u3053\u308c\u3082\u500b\u3005\u306e\u6a5f\u5668\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\uff08\u4f8b: 192.168.1.1 \u3068 \/24 \u306e\u5834\u5408\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u306f 192.168.1.255 \u3068\u306a\u308a\u307e\u3059\uff09<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u6570<\/h3>\n\n\n\n<p>\u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u306e\u4e2d\u3067\u3001PC\u3084\u30b5\u30fc\u30d0\u30fc\u306a\u3069\u306e\u6a5f\u5668\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308bIP\u30a2\u30c9\u30ec\u30b9\u306e\u7dcf\u6570\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u8a08\u7b97\u4e0a\u306f\u300c\u7dcf\u30db\u30b9\u30c8\u6570\u300d\u304b\u3089\u3001\u4e0a\u8a18\u306e\u300c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u300d\u3068\u300c\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u300d\u306e2\u3064\u3092\u9664\u3044\u305f\u6570\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af \/ CIDR \u65e9\u898b\u8868<\/h2>\n\n\n\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u8a08\u3084\u5b66\u7fd2\u306e\u969b\u306b\u3054\u6d3b\u7528\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<div id=\"id-bae08f7d-5e80-4c4f-9263-31a09fee39ec\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>CIDR<\/strong><\/td><td><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/strong><\/td><td><strong>\u7dcf\u30db\u30b9\u30c8\u6570<\/strong><\/td><td><strong>\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u6570<\/strong><\/td><\/tr><\/thead><tbody><tr><td>\/32<\/td><td>255.255.255.255<\/td><td>1<\/td><td>0 \u203b<\/td><\/tr><tr><td>\/31<\/td><td>255.255.255.254<\/td><td>2<\/td><td>0 \u203b<\/td><\/tr><tr><td>\/30<\/td><td>255.255.255.252<\/td><td>4<\/td><td>2<\/td><\/tr><tr><td>\/29<\/td><td>255.255.255.248<\/td><td>8<\/td><td>6<\/td><\/tr><tr><td>\/28<\/td><td>255.255.255.240<\/td><td>16<\/td><td>14<\/td><\/tr><tr><td>\/27<\/td><td>255.255.255.224<\/td><td>32<\/td><td>30<\/td><\/tr><tr><td>\/26<\/td><td>255.255.255.192<\/td><td>64<\/td><td>62<\/td><\/tr><tr><td>\/25<\/td><td>255.255.255.128<\/td><td>128<\/td><td>126<\/td><\/tr><tr><td>**\/**24<\/td><td><strong>255.255.255.0<\/strong><\/td><td><strong>256<\/strong><\/td><td><strong>254<\/strong><\/td><\/tr><tr><td>\/23<\/td><td>255.255.254.0<\/td><td>512<\/td><td>510<\/td><\/tr><tr><td>\/22<\/td><td>255.255.252.0<\/td><td>1,024<\/td><td>1,022<\/td><\/tr><tr><td>\/21<\/td><td>255.255.248.0<\/td><td>2,048<\/td><td>2,046<\/td><\/tr><tr><td>\/20<\/td><td>255.255.240.0<\/td><td>4,096<\/td><td>4,094<\/td><\/tr><tr><td>\/19<\/td><td>255.255.224.0<\/td><td>8,192<\/td><td>8,190<\/td><\/tr><tr><td>\/18<\/td><td>255.255.192.0<\/td><td>16,384<\/td><td>16,382<\/td><\/tr><tr><td>\/17<\/td><td>255.255.128.0<\/td><td>32,768<\/td><td>32,766<\/td><\/tr><tr><td>**\/**16<\/td><td><strong>255.255.0.0<\/strong><\/td><td><strong>65,536<\/strong><\/td><td><strong>65,534<\/strong><\/td><\/tr><tr><td>\/15<\/td><td>255.254.0.0<\/td><td>131,072<\/td><td>131,070<\/td><\/tr><tr><td>\u2026<\/td><td>\u2026<\/td><td>\u2026<\/td><td>\u2026<\/td><\/tr><tr><td>**\/**8<\/td><td><strong>255.0.0.0<\/strong><\/td><td><strong>16,777,216<\/strong><\/td><td><strong>16,777,214<\/strong><\/td><\/tr><tr><td>\u2026<\/td><td>\u2026<\/td><td>\u2026<\/td><td>\u2026<\/td><\/tr><tr><td>\/1<\/td><td>128.0.0.0<\/td><td>2,147,483,648<\/td><td>2,147,483,646<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u203b \/31\u3001\/32\u306f\u3001\u6280\u8853\u7684\u306a\u4f8b\u5916\uff08RFC 3021\u306a\u3069\uff09\u3092\u9664\u304d\u3001\u4e00\u822c\u7684\u306a\u30db\u30b9\u30c8\u901a\u4fe1\u306b\u306f\u4f7f\u7528\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30c4\u30fc\u30eb\u4e0a\u3067\u306f\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u6570\u306f0\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u8a08\u7b97\u30c4\u30fc\u30eb IPv4\u30a2\u30c9\u30ec\u30b9\u3068CIDR\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u30fb\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30a2\u30c9\u30ec\u30b9\u30fb\u5229\u7528\u53ef\u80fd\u30db\u30b9\u30c8\u7bc4\u56f2\u306a\u3069\u3092\u81ea\u52d5\u8a08\u7b97\u3057\u307e\u3059\u3002 IP\u30a2\u30c9\u30ec\u30b9\uff08\u5fc5\u9808\uff09 \u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af \/ CIDR\uff08\u5fc5\u9808\uff09  &#8230; 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